[clang] Adding `asuint` implementation to hlsl (PR #107292)

[Justin Bogner via cfe-commits]

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+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -emit-llvm-only -disable-llvm-passes -verify -verify-ignore-unexpected
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bogner wrote:

I don't think we should be using `-verify-ignore-unexpected` here - it makes it harder to understand what's going wrong if the test fails, and generally we shouldn't have errors that we're not checking for in a test.

https://github.com/llvm/llvm-project/pull/107292